diff --git a/src/main/Apis/Charge/Charge.cs b/src/main/Apis/Charge/Charge.cs
index 245e719..ba1b6d0 100644
--- a/src/main/Apis/Charge/Charge.cs
+++ b/src/main/Apis/Charge/Charge.cs
@@ -142,7 +142,15 @@ public class Bank
         public string AccountNumber { get; set; }
     }
 
-    public class BankChargeRequest : RequestMetadataExtender
+    public class ChargeRequest : RequestMetadataExtender
+    {
+        public string Reference { get; set; }
+
+        [JsonProperty("device_id")]
+        public string DeviceId { get; set; }
+    }
+
+    public class BankChargeRequest : ChargeRequest
     {
         [JsonProperty("email")]
         public string Email { get; set; }
@@ -173,7 +181,7 @@ public class Card
         public string ExpiryYear { get; set; }
     }
 
-    public class CardChargeRequest : RequestMetadataExtender
+    public class CardChargeRequest : ChargeRequest
     {
 
         [JsonProperty("email")]
@@ -189,7 +197,7 @@ public class CardChargeRequest : RequestMetadataExtender
         public string Pin { get; set; }
     }
 
-    public class AuthorizationCodeChargeRequest : RequestMetadataExtender
+    public class AuthorizationCodeChargeRequest : ChargeRequest
     {
 
         [JsonProperty("email")]
diff --git a/src/main/Apis/Charge/ChargeApi.cs b/src/main/Apis/Charge/ChargeApi.cs
index a5ee5e9..5b7533b 100644
--- a/src/main/Apis/Charge/ChargeApi.cs
+++ b/src/main/Apis/Charge/ChargeApi.cs
@@ -11,21 +11,28 @@ public ChargeApi(PayStackApi api)
             this._api = api;
         }
 
-        public ChargeResponse ChargeAuthorizationCode(string email, string amount, string authorizationCode, string pin) =>
+        public ChargeResponse ChargeAuthorizationCode(string email, string amount, string authorizationCode, string pin, string reference = null, bool makeReferenceUnique = false) =>
             ChargeAuthorizationCode(
                 new AuthorizationCodeChargeRequest
                 {
                     Email = email,
                     Amount = amount,
                     AuthorizationCode = authorizationCode,
-                    Pin = pin
-                }
+                    Pin = pin,
+                    Reference = makeReferenceUnique && reference != null ?
+                        $"{reference}-{Guid.NewGuid().ToString().Substring(0, 8)}" : reference
+                },
+                makeReferenceUnique
             );
 
-        public ChargeResponse ChargeAuthorizationCode(AuthorizationCodeChargeRequest request) =>
-            _api.Post<ChargeResponse, AuthorizationCodeChargeRequest>("charge", request);
+        public ChargeResponse ChargeAuthorizationCode(AuthorizationCodeChargeRequest request, bool makeReferenceUnique = false)
+        {
+            if (makeReferenceUnique && request.Reference != null)
+                request.Reference = $"{request.Reference}-{Guid.NewGuid().ToString().Substring(0, 8)}";
+            return _api.Post<ChargeResponse, AuthorizationCodeChargeRequest>("charge", request);
+        }
 
-        public ChargeResponse ChargeBank(string email, string amount, string bankCode, string bankAccountNumber) =>
+        public ChargeResponse ChargeBank(string email, string amount, string bankCode, string bankAccountNumber, string reference = null, bool makeReferenceUnique = false) =>
             ChargeBank(
                 new BankChargeRequest
                 {
@@ -35,14 +42,21 @@ public ChargeResponse ChargeBank(string email, string amount, string bankCode, s
                     {
                         Code = bankCode,
                         AccountNumber = bankAccountNumber
-                    }
-                }
+                    },
+                    Reference = reference
+                },
+                makeReferenceUnique
             );
 
-        public ChargeResponse ChargeBank(BankChargeRequest request) =>
-            _api.Post<ChargeResponse, BankChargeRequest>("charge", request);
+        public ChargeResponse ChargeBank(BankChargeRequest request, bool makeReferenceUnique = false)
+        {
+            if (makeReferenceUnique && request.Reference != null)
+                request.Reference = $"{request.Reference}-{Guid.NewGuid().ToString().Substring(0, 8)}";
 
-        public ChargeResponse ChargeCard(string email, string amount, string cardNumber, string cardCvv, string cardExpiryMonth, string cardExpiryYear, string pin) =>
+            return _api.Post<ChargeResponse, BankChargeRequest>("charge", request);
+        }
+
+        public ChargeResponse ChargeCard(string email, string amount, string cardNumber, string cardCvv, string cardExpiryMonth, string cardExpiryYear, string pin, string reference = null, bool makeReferenceUnique = false) =>
             ChargeCard(
                 new CardChargeRequest
                 {
@@ -55,12 +69,18 @@ public ChargeResponse ChargeCard(string email, string amount, string cardNumber,
                         ExpiryMonth = cardExpiryMonth,
                         ExpiryYear = cardExpiryYear
                     },
-                    Pin = pin
+                    Pin = pin,
+                    Reference = reference
                 }
             );
 
-        public ChargeResponse ChargeCard(CardChargeRequest request) =>
-            _api.Post<ChargeResponse, CardChargeRequest>("charge", request);
+        public ChargeResponse ChargeCard(CardChargeRequest request, bool makeReferenceUnique = false)
+        {
+            if (makeReferenceUnique && request.Reference != null)
+                request.Reference = $"{request.Reference}-{Guid.NewGuid().ToString().Substring(0, 8)}";
+
+            return _api.Post<ChargeResponse, CardChargeRequest>("charge", request);
+        }
 
         public ChargeResponse CheckPendingCharge(string reference) =>
             _api.Get<ChargeResponse>($"charge/{reference}");
diff --git a/src/main/Apis/Charge/IChargeApi.cs b/src/main/Apis/Charge/IChargeApi.cs
index 33e706c..5987a22 100644
--- a/src/main/Apis/Charge/IChargeApi.cs
+++ b/src/main/Apis/Charge/IChargeApi.cs
@@ -7,17 +7,17 @@ public interface IChargeApi
     {
         ChargeTokenizeResponse Tokenize(string email, string cardNumber, string cardCvv, string cardExpiryMonth, string cardExpiryYear);
 
-        ChargeResponse ChargeBank(string email, string amount, string bankCode, string bankAccountNumber);
+        ChargeResponse ChargeBank(string email, string amount, string bankCode, string bankAccountNumber, string reference = null, bool makeReferenceUnique = false);
 
-        ChargeResponse ChargeBank(BankChargeRequest request);
+        ChargeResponse ChargeBank(BankChargeRequest request, bool makeReferenceUnique = false);
 
-        ChargeResponse ChargeCard(string email, string amount, string cardNumber, string cardCvv, string cardExpiryMonth, string cardExpiryYear, string pin);
+        ChargeResponse ChargeCard(string email, string amount, string cardNumber, string cardCvv, string cardExpiryMonth, string cardExpiryYear, string pin, string reference = null, bool makeReferenceUnique = false);
 
-        ChargeResponse ChargeCard(CardChargeRequest request);
+        ChargeResponse ChargeCard(CardChargeRequest request, bool makeReferenceUnique = false);
 
-        ChargeResponse ChargeAuthorizationCode(string email, string amount, string authorizationCode, string pin);
+        ChargeResponse ChargeAuthorizationCode(string email, string amount, string authorizationCode, string pin, string reference = null, bool makeReferenceUnique = false);
 
-        ChargeResponse ChargeAuthorizationCode(AuthorizationCodeChargeRequest request);
+        ChargeResponse ChargeAuthorizationCode(AuthorizationCodeChargeRequest request, bool makeReferenceUnique = false);
 
         ChargeResponse SubmitPIN(string reference, string pin);
 
@@ -28,6 +28,6 @@ public interface IChargeApi
         ChargeResponse SubmitBirthday(string reference, DateTime birthday);
 
         ChargeResponse CheckPendingCharge(string reference);
-        
+
     }
 }
\ No newline at end of file
diff --git a/src/main/Apis/Transactions/TransactionsApi.cs b/src/main/Apis/Transactions/TransactionsApi.cs
index 20806c0..79e91d9 100644
--- a/src/main/Apis/Transactions/TransactionsApi.cs
+++ b/src/main/Apis/Transactions/TransactionsApi.cs
@@ -53,7 +53,7 @@ public ChargeAuthorizationResponse ChargeAuthorization(string authorizationCode,
                 AuthorizationCode = authorizationCode,
                 Email = email,
                 AmountInKobo = amountInKobo
-            });
+            }, makeReferenceUnique);
 
         public ChargeAuthorizationResponse ChargeAuthorization(ChargeAuthorizationRequest request, bool makeReferenceUnique = false)
         {
@@ -71,7 +71,7 @@ public ReAuthorizationResponse RequestReAuthorization(string authorizationCode,
                 Email = email,
                 AmountInKobo = amountInKobo,
                 Reference = reference
-            });
+            }, makeReferenceUnique);
 
         public ReAuthorizationResponse RequestReAuthorization(ReAuthorizationRequest request, bool makeReferenceUnique = false)
         {
diff --git a/src/main/main.csproj b/src/main/main.csproj
index 1288820..5525c18 100644
--- a/src/main/main.csproj
+++ b/src/main/main.csproj
@@ -4,7 +4,7 @@
     <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
     <PackageId>Paystack.Net</PackageId>
     <Title>PayStack API for .Net</Title>
-    <Version>0.7.3</Version>
+    <Version>0.7.4</Version>
     <Authors>Adebisi Foluso A.</Authors>
     <Company />
     <Product>PayStack.Net</Product>
@@ -14,6 +14,10 @@
     <PackageProjectUrl>https://github.com/adebisi-fa/paystack-dotnet</PackageProjectUrl>
     <PackageIconUrl>https://cdn-images-1.medium.com/fit/c/100/100/1*We_5HSqJAUVETQ7xgcJNQQ.png</PackageIconUrl>
     <PackageReleaseNotes>
+    -- v0.7.4 --
+    * Bug fix. Adds ChargeApi missing request DTOs properties: Reference and DeviceId - (#12)
+    * Minor bug fixes.
+
     -- v0.7.3 --
     * Bug fix. Transaction's ChargeAuthorization method included (big thanks to Aghogho Bernard - @teghoz)
     * Transaction's CheckAuthorization and RequestReauthorization methods now included.